Backblaze B2 Cloud Storage API vs Cloudflare R2
Free API comparison
| Backblaze B2 Cloud Storage API | Cloudflare R2 | |
|---|---|---|
| Category | Hosting and storage | Hosting and storage |
| API key | Needed, free | Needed, free |
| Pricing | Free for the first 10 GB of storage; more storage is paid per GB. | Free each month for 10 GB of storage, 1 million write and 10 million read operations; usage above that is paid. |
| Formats | JSON | XML |
| Interface | REST, MCP | REST, MCP |
| Provider | backblaze.com | developers.cloudflare.com |
| Last checked | Working on November 1st, 2026 | Working on November 1st, 2026 |
| MCP server | Yes, official | Yes, official |
Which one to choose
Both store files and speak the S3 API, so existing S3 tools work, and both have an official MCP server. Both keep 10 GB free; Cloudflare R2 also includes a million write and ten million read operations a month and charges nothing for outgoing data. For files served to many visitors, R2; for backups and storage you mainly write to, either fits.
Each service's own page has its full description, a code example and what visitors report: Backblaze B2 Cloud Storage API, Cloudflare R2.